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This answer will generally relate to your other queries as well.
The records, with images, can be found in the Drouin Collection of Ancestry.ca or Ancestry.com, which are paid subscription websites. If your local public library subscribes to Ancestry Library Edition you would have access to the records that way as well.
When searching for the Cathcarts some of the records are found indexed with only the last name.
You can also trace the Cathcarts in Montreal in directories at this link. Start at Serie principale and it is generally English after that.
http://bibnum2.bnquebec.ca/bna/lovell/index.htmlPolarbear